Can I use any of the various attachments for my Kitchenaid stand mixer to make peanut butter? I was thinking one of the different grinding attachments might work, insofar as the machine at my local merchant looks like a hopper full of peanuts and a grinder.
The only one that could feasibly handle it would be the grinder. However, in the manual http://www.kitchenaid.com/assets/pdfs/product/ZUSECARE/FGA_Use%20and%20Care_EN.pdf on page 5 it states "Note: Very hard, dense foods such as totally dried homemade bread should not be ground in the Food Grinder. Homemade bread should be ground fresh and then oven or air-dried." If dried, dense bread is too much for the grinder then peanuts would definitely be to much as well. My recommendation is to use a food processor.
KitchenAid meat grinder
WOO HOO!The answer is yes. Having read a number of homemade peanut butter posts, and coming to the conclusion that no one was brave enough to take a chance ruining their mixer or attachment, I took it on myself to try it with the meat grinder.
I used the small plate. What came out in just seconds, looked like spaghetti. On closer inspection it is just smooth, slightly grainy peanut butter. No strain on the mixer. I ran it through a second time. It came out with a sheen that indicated the nut oils were being pressed out of the nuts in the process.
I have used food processors. The drawback is that even the heavy duty food processors will burn out if you do it too often. It also takes a while to do it this way, and can be a pain to clean up.
I bought two different models of Nostalgia peanut butter machines. Both work but not optimally.
The KitchenAid mixer with the meat grinder attachment is a very simple and fast way to make peanut butter with no additives (just peanuts). I'm ready to sell my other attempts on craigslist.
Note: peanuts are actually very oily beans. They are not hard, and as the oils are extruded, the knife is lubricated. As I stated, no strain on the mixer at all.